This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 13 |
| 3 | 14 |
| 4 | 15 |
| 5 | 16 |
| 6 | 17 |
| 7 | 18 |
| 8 | 19 |
| 9 | 90 |
| 10 | 0 |
| 11 | 100 |
| 12 | 103 |
| 13 | 104 |
| 14 | 105 |
| 15 | 106 |
| 16 | 107 |
| 17 | 108 |
| 18 | 109 |
| 19 | 900 |
| 20 | 0 |
| 21 | 1000 |